The Behaviour of a Nominally Isotropic 0.17 per cent Carbon Cast Steel under Complex Stress Systems at Elevated Temperatures

The work described in this paper is part of an approved programme, undertaken to investigate the behaviour of an isotropic 0·17 per cent carbon steel under general stress systems at elevated temperatures. It relates to an experimental study, and analysis of the time independent plastic strain properties in short-time tensile and torsion tests at temperatures between 20 and 550 deg. C. (68 and 1,022 deg. F.).

The object of the investigation is to obtain relations between stress, strain, time, and temperature, to afford a basis of design in cases where steels are subjected to plastic deformation under general stress systems at elevated temperatures.

Pure tensile and torsion tests have been made at temperatures of 20, 150, 350, 450, and 550 deg. C. (68, 302, 662, 842, and 1,022 deg. F.), and at various rates of stressing. The results of these tests have been analysed, and information derived concerning the nature of the criterion of elastic failure for this material, and the nature of the stress-plastic strain relations after plastic strain has been established. The effect of rate of stressing on these latter relations has been examined.